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Synapse previously did not correctly cap the max depth of an event to the max canonical json int. This can cause ordering issues for any events that were sent locally at the time. This background update goes and correctly caps the topological ordering to the new `MAX_DEPTH`. c.f. GHSA-v56r-hwv5-mxg6 --------- Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>